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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '68ffd657bb65c514ccbe0e0bae9c174c12958f6bf5e13d3cce02c20acf93fe89' 
  AND token = 'bqd4Me1WGkx2IyZZPdtzvKrodfwkheFXVisj30gG8Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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