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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2019a60e51b023f84404af2e520ee31587420368778ef219d6e612bfd0934c6d' 
  AND token = 'aNDN8D6NaZLYyIKCagBZjwAnUECh1RB1hfRLWokEKKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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