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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ca57341fcce7fc15590003a4eb0af70c2625ffae56f80c7713fdca2e08ff85d' 
  AND token = '/FW3O82hENg/RLBeSO0Q8FHXH8gDnLAl1FMNg4qp6EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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