SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '95c16c386c9246bf613f623bb9728a776fcf4ef00da53fdf0b1021590e59dfa4' 
  AND token = 'VwgfJc7hYl+I4TomEAs2wVLqbh5cnaG+eMWs+DUCU8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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