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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '214aecef103d864de75ff0f056e82e6e82a1e32266fddafe5176cab0b16c5f69' 
  AND token = '/l5FLYQh0gEd7/Ew2Pvu0sJ/Hpq4KmCkH282s3DaAXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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