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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8b30284da8ffded602b3b3e7e8f90f5117a6c81bbdb1f750824b6220f284b8e5' 
  AND token = 'Sw3uh6Lxir83EzvWMMwj5c7Ngmn9LP4VnUl8oblUtrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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