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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0104acd5e4d5c16fd66a378e90ec8cbe0c8133790d9156a8a7f05c1e0937e29f' 
  AND token = 'CWJ8BRkc+v3KSteE3rDzcFKf3cNzW4sx8RtLidtP3Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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