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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a6c7523bda97d82d4316141cd7564a4e67ceb5b0e8f39be15154419ca9807efe' 
  AND token = 'NQbT1bB/L+XfIfno3/RqvnIaOp4qmyRn+yuzbyUra+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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