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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '16f813e2cdaa1146f84cbc33c3f2c13766998ef999e9305e79ef3e93b82b2472' 
  AND token = 'gaDYfweSgDwIxm2h/w5K7GrRyD/CIQce4AB07k2x4aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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