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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3cd229d7498b83e6cda7405e88df5504ba8135dd09f19021204c63d005175a91' 
  AND token = 'waRaom1l2g0g1dNG0Z0LX01ZHo0VmF7RvivH4yNcNPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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