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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '961bbec63eb0ad17efb4bdba8875bd1f8fee63c926278d86fde1c8172b451cfb' 
  AND token = 'dl9sX6UoAN/RekZg56cepoHR8THj0w5eBZTyn9QYhgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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