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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd2357cae001538afe8d2aa6ba2454e267e1414e1806713017815701a4416f4d1' 
  AND token = 'zIsDZPHATOu4cBV0JzKGw81vQ0suWVzs2AtQxk79Xb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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