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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '126efb2773ba9d66e876bb78dd01d3232c8007ccf395d98e9235a8a654407964' 
  AND token = 'saB9WSbRzsWLko3SmZDsNT1BZZcXc/1Cy9ACCV2SDSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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