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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ce19bcf211af68ae2bcb2e11e3dbaeacf1288c33c3b80af80faa90ba28f6d74' 
  AND token = 'ngAkkU7S37BR09Y7IGIM4/iyfmgrxHHgd7sPW6oDlgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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