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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c0e11713916ab8defc47c5eda98ff44243ce04358c1486d68f8f9aa886fe4e02' 
  AND token = 'OB9xvza1b87GwwqyEVQgnCAUF9Uu50skMoG5jmtvMCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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