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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a900b0c5f83ece992bd2128b077b75561a0c87e40b927c1d6613bbf77ebb8f91' 
  AND token = 'YMbMyrR0VGyQXth+B9xf0AXA0d0DsWBnn8LQeSrdo0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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