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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '40ef2848821ec3b9945aea64d1460e211473f3d158eb6b44f5eba8e8d35674e8' 
  AND token = 'H0K3zdCTcuT+UC/dr28Pw7CaaQqf7Bb9c4YqQxc5Zx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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