Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ab29397cdc63748d8e296469e27370d8497d1bc2cfcebeec5382a602d343e83' 
  AND token = 'ycdXsq8vgIklcmeCu17p2wVR6y+tYx38cv62XS7XyiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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