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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8040f4ea07c28fe7b0d3117d762ef6e39ac075df4938de4a62ae70e6982d29ca' 
  AND token = 'kL/gVygrMnrTnPTwIdYEIaGOQGydak7BMH60QN5Y7Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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