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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd02c10e490b677f5d8540711fd3e3f08019a43dd855be28a6b68aa7bfcb83baa' 
  AND token = 'g+Yf3HHW99NSreVpN0gUjyn8lQ3Baoeb7QtDscTaPCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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