Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '75a4a490518b6164c88a732965291a55d6e53d6c76fa5cdd00fec03419a9f8b7' 
  AND token = '5xTCfR9r0+faChLvi0esvB1slzLjb5BEsy35gSi59Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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