SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0937ffa8f98774fac5e1c6907fb441dc7e1de0d79380062d6891ebd552392e32' 
  AND token = 'olmfjMsmq9jeQKN9VPk/WJvS0zoTMBCtvwETzJDirg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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