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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4ee9c0d9913e3b0fc6c2ccc88009596cca3580e4475d994f1d8ef90f6298d0c8' 
  AND token = 'LPccfN0DmaD9pqbjy9i7Fu6Ibd6f5WxgjsJgKTsAOtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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