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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e62fbcee4db2499880c6c80e3b50c1f4f27a51207765270cf657cded27ca4ba6' 
  AND token = 'WEAIRCRkMD/DX7Vy0KDGcwejFMhejiPLN/wBpkSLGLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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