SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f65caa31606316a8c4c35ac9b7a51421a68c695921f5836fd8e9fda35472a0b' 
  AND token = 'nCNgfBMjDyFgeqnNV/0DVWXm/nWoRFnmPATfozb9hmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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