Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '917c7badda3ba983f5e2f3c0aa54210de5fd2dd33fc2b47cc9813b05bb5fc9f0' 
  AND token = 'iv5TrhFmX2HFSMHjmQD5nsh84ME8cwLxB1/oJyOzEEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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