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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb89dc00f09622c2eb449781ecada56e593cd9f01bd4c10f22edd1c877e3fa02' 
  AND token = 'kluS6AMCL6YHSdUA8jE39gAznTl17jmgKyXbNUyLxbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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