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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2c0d98994f9a414e60e0a7548df36c5f7b4294b2ee7b0e54086445bd1755385' 
  AND token = 'exhETo5vGJ0FGNWBD2oEpGXW5TTawS81Oy6qJ8lqp9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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