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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5266a275f61ce272e34b62682ffc6d4d8ec52fe8a1e33ff65ef58fae320f6e3c' 
  AND token = 'A1FMj9ehoDweHu9ucBbzHYZGn3ci+64oxcsqH27rZaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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