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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ed6f9536869180d3f6447fc1bf7a33f79ba99c1fd966eec0ccbe507f6586ce6' 
  AND token = 'EWDfk6/CH8iWoLp/HlZ0CJuWZ0MANEJGYVZhXaofpU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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