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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ed6538a6e115fb514197a6560062770d93f1ad00948130ab0d37fe3759f9a487' 
  AND token = '5CjNRb/dXhujCpQ4BsRFsg+P+a23llF75ASutEiRviA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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