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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a88d539beddf81f93afd22a7b21c0c7091531b1575deeacb1df87bd67493951' 
  AND token = '8FtLBr/oNwiCxn4TX7CA3kedgRhv8fQ0ncHn63T6gp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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