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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5fda7ca05d594eae8a1c6beeee6ca2a209084606d3c919d3a97ebdcd79714fb4' 
  AND token = 'AROyoE2huhq376z4mBReS6wyOEorpVm8mYi9ahIraas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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