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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3e652c1922fc7bab6affab63356dd56f43880087ad12d16ae275fab26c1cea79' 
  AND token = '8BqGQSBQXosfdR9OeKzEI4FGR/qYdmtIk1jrA76QYKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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