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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba31350f63091e2377d6cb42f47cc80e92bcb383d1212b3f3ed28acc79ac0fab' 
  AND token = 'l6zrwwyYeTh8sKSucCfg79vvFt85an28yfgDNCAkGVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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