Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a7c0cddfe2f0784f8e843817c0b14ea8f5707551bafd0bba62baf36e733e51' 
  AND token = 'pHue1y9/n/2ClnqtFUcLCHjgbr/8Qp3LRTULq3uQvXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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