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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c531e3e68df8500649bfaf937b3919c32154f66e548c1ed931eb5f6594440c14' 
  AND token = '9GvKOyKVDFDATNG8UmN6nsk/pmAv8jtuK3yvkBlmYkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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