Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f29340e32739501639d43b52854f7183eab2a69498f9a87a943b223047ad2f' 
  AND token = 'Cg9zxMU8NYqZYEh/QC700DBImGGl372bsxq6NkHxvc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}