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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a677f770f2c796f72e4f2c7ad63f01352ec3accdd853a70f325f5d4cac176080' 
  AND token = 'eMjb1XDw6mJcK5VbMheqZXVWLbdjKVWLMgX4fHS7vMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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