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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f5626726b6e3db507f6fc3e83bee2f109ace64e7116292b3bdbc3b328b0557b3' 
  AND token = 'yLsb8Qz+74tUSGtzi13Imh2jH/bqH0N07Ra5omcndxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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