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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5fd201bf7401f10f2e0f1c105ddb92c017d14b51df00b32f8df6467110e8a9a1' 
  AND token = 'Tujb9kLIOnhDpEl9vg7vlAve+E6ejHxZhFa1Y+V8z/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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