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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c870cdf7b7ed6a336b72c816df3167deeadd8aa46f95201aa6e063971d471c1a' 
  AND token = 'rV9xsI/nTrj7DbvzwPAmA+o4mrdh6ZAyenD8kw9bk1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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