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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '394c9d19c4b498375bf84baab7d0143a543d4e90aad1d23d88bd102fb0659428' 
  AND token = 'JpUY/bcFx7rSqBz76mS8sW6nyD4Jf42+f3e9S1PM+kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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