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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8c4a5e2d90b70c2a05a4121dca96d55bb4e3d78b4a58179cb276b5cfa8202fc4' 
  AND token = 'OPYKxX3s5MJ2EQebjyPrNgwC0ECIE45nowljC9WSr+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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