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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f3eff419b2a98399603e9ed3ce962b58b4aa8cfe454c25ece83a1cf14c7e326' 
  AND token = 'dkpEIx0djwzY9Ia8S5mLKxPpXr6XQPWjQw2yBHFr1Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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