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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f62c6ceb89c6caa562b208f3a228e2d55a7b449d683401ead5f0c6fe6b85a826' 
  AND token = '3yDhO7kFb//m0y21marJsaR8ehKILytBSlL9OeS0ozM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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