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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd38d087cf73bcf8c172802a42cd1e8f9b807f5b33411c4c9b8857a82e034a405' 
  AND token = '8uu+2zbvHvCp4/xgkIU+tt1wm1t8/Aov6UcXk4S81vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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