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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f47cf701c4fddc46ee2c5b3fd698dfd97defae01882d3051d86362f94f63627' 
  AND token = '5tELlMEETqdn+HevFQz+T+ew+BMOmr+rTF0kQjFGzWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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