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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6cc4fcb278fbd6aba2acb9548f7c21f9cc5e7116e3b4adbf2ac5d61c95c72b28' 
  AND token = 'xWfD0QbRz7Mw1WT0Gw8SEqZWAOcMwxgYXps5eN0LHOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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