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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '575905cf55e09af21fb711db573fd3cdd07163354ab77bcb8446add63641ced4' 
  AND token = 'efEk47CVqQU7/E96p4B4iw1A5t/I1SAaAykRYQ9HmhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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