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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a3bfc97e7a78196e14f4aa9c66a274b40099f086d263a78e45392d5afc34dc6e' 
  AND token = 'FyxJlTJGWC7oVh4NfAzRkLLeXA0F6SDURGObNdF+ARM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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