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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12196e5a0d29c232168975c28443c27e5e8d5cb7bad75422fbf5809a1f662a23' 
  AND token = 'L5hb9NKC13FH8V3EUO8wgh1pe62p05K42mphY2o3/WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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