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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e4a286c7a970dec25e5eb8b636ab86be9a185e86535d4cb1ee944b9bbeef01d' 
  AND token = 'ntMpPazksixpWqPQNF4WiPgQJ60N9DghGAuxIoMmjQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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