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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4de6de52f55f31225976d18de99fe03ef2c1383e6f64b37d17c73216cb073274' 
  AND token = 'smq9lJQaMrzXKSnkJqtNmoRZcixj4wnAA1UTEAcKFrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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