Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bdebfc1263cdb04c8fb052f0b237c365e26d4ca2464007eaef5b451b5e4e10' 
  AND token = 'VAGJ1ZMmwpfUexqSClvnZdg84F0kmUXPmgO0CLEs4eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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