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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'da8bc4f2cd9ebc548a3daa84eedb7f571a9213e91be75cae3ec3e95250ff3e83' 
  AND token = 'jKB6owI4mYMkz4CL09zPAYQSUlZ7wpmuvwrBqW161ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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