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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c99efae7ef26675daf0eb292594e8f612102f612fdafbd66d14fdcfdf587711a' 
  AND token = 'E0ZbF2Cay0AQMP/NAxarLl9g27qmb16bUl6aQbr0Y+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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