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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '68d6517c60c4d5177698fb98f5b8eb0f350a5e553bbace0fd9aeea28fb03aaf1' 
  AND token = 'Z5QVTW1hzS3KoVXeLPmvJS1Exzrd63875PhApOqjNvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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