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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '383f2adef30aa2ea8455595cdd6c2e26aefd58ccbee0e2deb18e8144539843dc' 
  AND token = 'YDpA10CN6AQ8uKVV9HCrVdU9WBeqwnKvx/h4UcnV2vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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