Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd2b59c444b503934dcd1d9f42af9c8efb89d7d1d016099440b111ce73251ea' 
  AND token = 'Hf6ANap7Sx5OsmQbRmeqvmW3fjQVyeSfQ2ejM9J2N4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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