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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd936fab986ccb580bd558bf85d4cf86ff70ad498af1d9bcda067e111f5969f50' 
  AND token = '48gJNyr66iuz8IpZqRrsGqZl2MygVjUSwEt01te30Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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