Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0c2962f6f31b94af35212bc9b0c645c6857610b9096cb9c6772499f159e08a' 
  AND token = '0V+2492F/OzxnwVkSfRXP+89v3OfkoXOFPc0uNcz3JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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