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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c9d439e058dc4e2a4b19cd9e099b5380329dda48196b965b7d0a3cf804456f8e' 
  AND token = 'oBsd2uiSXwj4WrNjGQaevui5BYukCmN7S7wigKUKKeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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