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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a98515f7c1dfb40c62a38875b8fe69e88ee79a1a620ec67cad64a1531e0a19e0' 
  AND token = '15rPdL++7ph2jGNJPY+Jfs3zBOhXh0LErM6P9IwE8P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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