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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae55a26c2d6921ea16b79f30b1d9671faeef56c946ad0200cadba0289b8f07d8' 
  AND token = 'uf51Psyj+4omioAM/raHwNl7wB+RQY+remm124A7Huo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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