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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2673f6e879f52cbaa5233235097bfa75a36e6e415ab9c7d1ef92cdda3ddae773' 
  AND token = 'g8udjaJYQKuaf+DQtVeugIPAeO/sg3oC4qg91/10C84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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