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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e67e47efa2f790673672cd3952af500c58c1478c69b25af7677015ef89f8d5e1' 
  AND token = 'MGgm46yK48Y0Uuz+6kgBVsse9xd2DDFDmbdsFY/Na0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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