SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '06733ef25cb448e897e0313f9b27711bb0c4fd2fd6dc3455f5d7fd2af68cb620' 
  AND token = 'EEGs3YNQWUb+g0/0PkqYK8E4aWLehF/dZh4REd0nM/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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