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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3ec4872c81dfceef972790537ac7cbecabf426342c10bb1a5d5064952a68110a' 
  AND token = 'WJfYIEUrz5VpKVaibpvs/96VlhTupQ6vpIS10odsrus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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