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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cdde6f23d76f47b17963b7598f34ee6d763bb3589df1374d388b6e6b87a1d20c' 
  AND token = 'Ml7pjbyy9dKSAlkAc/GqATsFbDpUrCLo9qs4eRE6M5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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