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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8309171d7aec2928145f888d32fc5ff265bcb103c4f1e20225ee1354a7784040' 
  AND token = 'scKp7sDm8xp3wsZwtcPwGaOklG6MxXUuTAA7AVZGRrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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