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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '656b323a389eced5b5412f267e090822c4e9708a7bd5f7f15a6e7d727455e2c4' 
  AND token = 'CmKMbust+YHbIb1iQlGvc/IF6ErAUND1VcLjoo5oMFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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