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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9a771fe248c73134f3d48fefee2ff67aa7663f16a7344806b885a5e5ba5a3237' 
  AND token = 'c0m5nUCD837Dyg2ynFqNC33A8EPzXK/L2S0xg/Vi22c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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