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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8177e7c4db8c9edb1ad64c1bfa310e58b18b42652d5865241f86009ac67db147' 
  AND token = 'hKB8d5IqeGni02K6zNodf2PaNNjP2UCWqekiCmRMwZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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