Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47e1e38d2e81756fc2000c540cd16c2a1c0fc74f3400e43d30cb9e739d51fc4' 
  AND token = 'L2G2fTN8i92tPtAeF5H++zwmJX+l6Z4mv2pOa8QIWYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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