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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd9d9fdc925c2b5d6ab075d3eb650c6476523efad0f36fb5c8a82c6ca0f7c5369' 
  AND token = '5IyAnXTkhcP6mMyEpdAHyqtYAdlw8Oi2Z5NhmXxoR/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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