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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '77ca6934000dc14b37b20b756f98be5f9f8b23a2262cf6946720c0ac2a8f92c6' 
  AND token = 'fXvRp9Holcs5+6vUwVT34cclO7TMEnzm2k0VO9BkV30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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